Also, blanks in your columns could mess it up as the counta in the named range formula may not pick them up.
I think I started you down this track with an idea that large named ranges could slow down the countifs. Apologies if it's a faff. I don't know the size of your data, but it might be worth trying to see if changing the named ranges from F:F to F1:F10000 (or something) actually does speed up your sheet.
Also, blanks in your columns could mess it up as the counta in the named range formula may not pick them up.
I think I started you down this track with an idea that large named ranges could slow down the countifs. Apologies if it's a faff. I don't know the size of your data, but it might be worth trying to see if changing the named ranges from F:F to F1:F10000 (or something) actually does speed up your sheet.